Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (1): 47-52.doi: 10.3969/j.issn.1673-8926.2008.01.008

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The origin of carbonate cements and the influence on reservoir quality of Pinghu Formation in Xihu Sag, East China Sea

ZOU Mingliang, HUANG Sijing, HU Zuowei, FENG Wenli, LIU Haonian   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology,Chengdu 610059, China
  • Online:2008-03-15 Published:2008-03-15

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Abstract:

Carbonate cements are the most abundant authigenic minerals in the reservoir sandstone of Pinghu Formation in Xihu Sag, East China Sea Basin. The analyses on thin section, cathodoluminescence, and elemental composition and carbon isotope showthat siderite, ankerite and calcite are the main minerals of the carbonate cements in Pinghu Formation. The siderite cement is mainly generated from syngenesis to early diagenesis, with highest δ13C ( 0.75‰) and δ18O ( - 10.22‰) . The δ13C of ankerite varies from - 2.45‰ to - 2.98‰, which is concordant with the coeval sea water, and the δ18O of ankerite is low, with least of - 12.39‰, and occurs during the early diagenetic stage. Granular and poikilitic cementations are the main occurrences of calcite cement. Granular calcite has many origins; however, the origin of the poikilitic calcite cement is closely related to the aluminosilicate minerals and the transformation of clay minerals. The siderite and ankerite precipitated in the early diagenetic stage enhanced the mechanical strength of rock and resistance to compaction, which is favorable for the reservoir quality, while the intergrowth calcite cementation generated in the late period is disadvantageous for the reservoir quality.

Key words: reservoir characteristics, classification evaluation, Yanchang Formation, Ordos Basin

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